[450] "The Link" interface board

[David McKenzie]

i think ill stop at v1.4


On Sun, Sep 29, 2013 at 3:47 PM, John Foege <john.foege at gmail.com> wrote:

> Looks much better on this one
>
>
> On Sun, Sep 29, 2013 at 9:19 PM, David McKenzie <k1fsy at vhfwiki.com> wrote:
>
>>
>>
>>
>> On Sun, Sep 29, 2013 at 2:27 PM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>
>>> I'm not really sweating it. I did find some problems on that Rev tho
>>> that when I fixed it made the audio trace shorter and saner. For 12 bucks
>>> for 3 I'm not going to get upset about having to re order.
>>>
>>> Parts came out to about 10 bucks pp plus 4 for the board isn't too bad.
>>> Plus I can sell one to Chris for his micro link!
>>>  On Sep 29, 2013 2:20 PM, "John Foege" <john.foege at gmail.com> wrote:
>>>
>>>> Nice...never heard of it. BatchPCB was the best I could find 4 years
>>>> ago or so....but you know the whole "maker" community probably has opened
>>>> up a lot of doorways. Some of those autoroute traces are looking mighty
>>>> sketch.
>>>>
>>>> Not much clearance between the traces and no ground planes !!! I hope
>>>> crosstalk on the audio lines and noise is not an issue....*skerred*
>>>>
>>>> What's the turn around time on the boards?
>>>>
>>>>
>>>> On Sun, Sep 29, 2013 at 8:16 PM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>
>>>>> u betcha!
>>>>>
>>>>> osh park is cheaper than batchpcb with no setup fee and free shipping
>>>>> to boot.
>>>>>
>>>>>
>>>>> On Sun, Sep 29, 2013 at 1:45 PM, John Foege <john.foege at gmail.com>wrote:
>>>>>
>>>>>> Auto-route FTW !!!
>>>>>>
>>>>>>
>>>>>> On Sun, Sep 29, 2013 at 4:24 PM, Bob <n1ujs at toast.net> wrote:
>>>>>>
>>>>>>> Gotcha
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Sun, Sep 29, 2013 at 10:21 AM, David McKenzie <k1fsy at vhfwiki.com>wrote:
>>>>>>>
>>>>>>>> I figured it either turned invisible or was ultimately made up and
>>>>>>>> was thus illusive!
>>>>>>>>
>>>>>>>> =D
>>>>>>>>
>>>>>>>> Some pics which I thought I attached to the first message
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sun, Sep 29, 2013 at 10:13 AM, David McKenzie <k1fsy at vhfwiki.com
>>>>>>>> > wrote:
>>>>>>>>
>>>>>>>>> In anticipation of assembling the link in some sort of "final"
>>>>>>>>> configuration, I decided that in lieu of the illusive Nomic that was
>>>>>>>>> originally destined for this project I would put together a plug-in board
>>>>>>>>> for the RasPi that has similar features.
>>>>>>>>>
>>>>>>>>> I have 3 copies of the board being printed (at the bargain price
>>>>>>>>> of $15). It exposes seven GPIO ports for PTT and other features of the
>>>>>>>>> radio that may or may not need to be controlled, and the pins from the
>>>>>>>>> header also allow for "green wire" mods for analog or digital inputs if
>>>>>>>>> necessary.
>>>>>>>>>
>>>>>>>>> It also has +5V/GND connection to power the raspi from an external
>>>>>>>>> powersupply/voltage converter rather than USB.
>>>>>>>>>
>>>>>>>>> There are two 3.5" stereo phone plugs, one plugs into "audio out"
>>>>>>>>> from the RasPi itself, the other is for a monitor speaker if desired. Audio
>>>>>>>>> from the rig to the RasPi is to connect directly to the USB sound dongle
>>>>>>>>> (not in the schematic), and audio/ptt out to the rig is via an RJ45 jack
>>>>>>>>> with jumpers to select which pins do what. The audio from the RasPi to the
>>>>>>>>> radio goes through an isolation transformer and can be varied in level by a
>>>>>>>>> 10k pot. I "borrowed" the audio circuit from the Nomic schematic (it's
>>>>>>>>> identical to pretty much every other rig audio interface circuit I saw as
>>>>>>>>> well), so hopefully it works out ok.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
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>>>>>>>>
>>>>>>>>
>>>>>>>
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>>>>>>>
>>>>>>
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>>>>>>
>>>>>
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>>>>>
>>>>>
>>>>
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>>
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